page_title: International Date Line
hierarchical_section_title: International Date Line
caption_attribution_description: English: Map illustrating the current (post 2011) International Date Line Deutsch: Karte, die die aktuelle (nach 2011) Internationale Datumsgrenze illustriert
context_page_description: The International Date Line, also known as just the Date Line, is an imaginary line on the surface of the Earth, going from north to south in the Pacific Ocean. The date becomes one day later as one travels across it in western direction, and one day earlier as one travels across it in eastern direction.
  The reason for this effect is that the countries on the western side of the International Date Line, have the time zone 10–12 hours more than Greenwich. And the countries on eastern side of it have the time zone 9–12 hours less than Greenwich. So when travelling across the line, one's watch has to be adjusted 20–24 hours, depending on the time zones.
  For example, New Zealand is twelve hours ahead of Greenwich Mean Time while Hawaii is ten hours behind Greenwich Mean Time. When travelling from New Zealand to Hawaii the clocks must be switched 22 hours backwards, about one day.
context_section_description: The International Date Line (IDL), also known as just the Date Line, is an imaginary line on the surface of the Earth, going from north to south in the Pacific Ocean. The date becomes one day later as one travels across it in western direction, and one day earlier as one travels across it in eastern direction.
  The reason for this effect is that the countries on the western side of the International Date Line, (in or outside eastern Asia) have the time zone 10–12 hours more than Greenwich. And the countries on eastern side of it (Alaska/Hawaii and other areas) have the time zone 9–12 hours less than Greenwich. So when travelling across the line, one's watch has to be adjusted 20–24 hours, depending on the time zones. 
  For example, New Zealand is twelve hours ahead of Greenwich Mean Time while Hawaii is ten hours behind Greenwich Mean Time. When travelling from New Zealand to Hawaii the clocks must be switched 22 hours backwards, about one day.
caption: The International Date Line around 180°
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